The wild birds that frequent the bosom and shores of the Potomac, are very numerous. Among them are the swan, the wild goose, the red-head shoveler, the black-head shoveler, the duck and mallard, the black duck, the blue-winged teal, the green-winged teal, the widgeon, and, last not least, the far-celebrated _canvass-back_. This duck, which we believe is unrivalled in the world for richness of flavour, is one of a class called _drift fowl_, from their habit of floating in the middle of the river when at rest. The two species of shoveler have the same habit, and are scarcely inferior in flavour. The canvass-back breeds, it is supposed, on the borders of the northern lakes, or on the shores of Hudson’s Bay; and in their migrations confine their pasture almost exclusively to the Chesapeake and Potomac. They feed, it is well ascertained, on the bulbous root of a grass which grows on the flats in these rivers, and which is commonly known as wild celery. It is said, that during a hard winter, some forty years ago, a strong wind blew so much of the water off the flats of James river, that the remainder froze to the bottom, enclosing the long tops of this grass so closely in the ice, that when it broke up, and was floated off in the spring, it tore whole fields of it up by the roots, and destroyed the pasture. Since that time, the canvass-back has never been seen on the river. The bald duck feeds very frequently among these water-fowl; and not having the power to dive entirely under water in search of food, he watches for the rising of the canvass-back, and, by his superior quickness on the wing, seizes on the celery the moment it appears above the surface, and escapes with it to the shore. The canvass-back is often shot from behind blinds of brush, which conceal the sportsman, in the midst of their feeding ground. There is a practice, however, of _tolling them in_, as it is called, by shaking a coloured handkerchief tied to the branch of a decayed tree. On what propensity of the bird the success of this manœuvre is founded, it would be difficult to say. There is no doubt of the fact, however, that they are thus decoyed within gun-shot; and it is related of an old sportsman on the Potomac, that a long queue of red hair, which he wore in a brush, and shook over his shoulder, served the purpose admirably well. Perhaps we have yet to discover that birds have _curiosity_. Among the many varieties of wild fowl found on the Potomac, below Harper’s Ferry, is the wild swan. The young bird is considered a great delicacy; while the old one is hard and without flavour. In a book on the District of Columbia, by Mr. Elliott, there are some curious particulars respecting their habits, and the manner of taking them.